Toyota Highlander Service Manual: Emission control system (2AZ-FE)

Emission control

...

Location

SYSTEM DIAGRAM The emission control system is determined by the ECM based on signals from various sensors. ...

More about Toyota Highlander:

Radiator and condenser
Check the radiator and condenser and clear away any foreign objects. If either of the above parts is extremely dirty or you are not sure of their condition, have your vehicle inspected by your toyota dealer. Warning When the engine is hot Do not touch the radiator or condenser as t ...